/* 壹座·智能体素材广场 — one plaza, two audiences. Visual kinship with the
   line's static sites (site-zhiyu): deep navy, serif display, mono accents. */
:root {
  --bg: #0a0f1e;
  --bg-soft: #0e1728;
  --line: #1b2638;
  --line-strong: #22304a;
  --ink: #e8ecf4;
  --ink-dim: #9aa6bc;
  --ember: #e0895f;
  --cyan: #4fd0d8;
  --fog: #b6ac97;
  --serif: "Noto Serif SC", "Songti SC", "SimSun", serif;
  --mono: "IBM Plex Mono", ui-monospace, monospace;
  --sans: "Inter", "PingFang SC", "Hiragino Sans", system-ui, sans-serif;
}
* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: var(--sans);
  font-size: 16px;
  line-height: 1.7;
}
a { color: var(--cyan); text-decoration: none; }
a:hover { text-decoration: underline; }
.mono { font-family: var(--mono); }

.skip-link {
  position: absolute; left: -9999px; top: 0;
  background: var(--ember); color: #0a0f1e; padding: 8px 14px; z-index: 10;
}
.skip-link:focus { left: 12px; top: 12px; }

/* topbar */
.topbar { border-bottom: 1px solid var(--line); background: rgba(10, 15, 30, 0.92); position: sticky; top: 0; z-index: 5; backdrop-filter: blur(6px); }
.topbar-inner {
  max-width: 1080px; margin: 0 auto; padding: 14px 20px;
  display: flex; align-items: center; gap: 12px; flex-wrap: wrap;
}
.brand-mark { color: var(--ember); display: inline-flex; }
.brand-name { font-family: var(--serif); font-weight: 700; font-size: 17px; letter-spacing: 0.02em; }
.brand-en { font-family: var(--mono); font-size: 11px; color: var(--ink-dim); }
.topnav { margin-left: auto; display: flex; align-items: center; gap: 16px; flex-wrap: wrap; }
.topnav a { color: var(--ink-dim); font-size: 14px; }
.topnav a:hover { color: var(--ink); text-decoration: none; }
.locale-switcher {
  background: var(--bg-soft); color: var(--ink-dim); border: 1px solid var(--line-strong);
  border-radius: 6px; padding: 4px 8px; font-size: 12px; font-family: var(--mono);
}

/* hero */
.hero { max-width: 1080px; margin: 0 auto; padding: 88px 20px 48px; text-align: center; }
.hero-title {
  font-family: var(--serif); font-size: clamp(30px, 5vw, 46px); line-height: 1.35;
  margin: 0 0 18px; font-weight: 700;
}
.hero-lead { max-width: 720px; margin: 0 auto 30px; color: var(--ink-dim); font-size: 16.5px; }
.counters { display: flex; justify-content: center; gap: 36px; flex-wrap: wrap; margin: 26px 0 14px; }
.counter { display: flex; flex-direction: column; gap: 2px; }
.counter b { font-size: 30px; font-weight: 600; color: var(--ember); font-family: var(--mono); }
.counter.asof b { font-size: 18px; padding-top: 8px; color: var(--cyan); }
.counter i { font-style: normal; font-size: 12px; color: var(--ink-dim); }
.hero-paths { display: flex; justify-content: center; gap: 22px; flex-wrap: wrap; font-size: 12.5px; color: var(--ink-dim); }

/* chapters */
.chapter { max-width: 1080px; margin: 0 auto; padding: 56px 20px 24px; border-top: 1px solid var(--line); }
.chapter.wide { max-width: 1180px; }
.sec-title { font-family: var(--serif); font-size: clamp(24px, 3.4vw, 32px); margin: 0 0 10px; font-weight: 700; }
.sec-lead { color: var(--ink-dim); max-width: 760px; margin: 0 0 26px; }
.sec-ink { font-size: 12.5px; color: var(--ink-dim); }

/* category cards */
.card-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(300px, 1fr)); gap: 16px; }
.mat-card {
  border: 1px solid var(--line-strong); border-radius: 12px; padding: 20px 22px;
  background: linear-gradient(180deg, var(--bg-soft), rgba(14, 23, 40, 0.4));
}
.mat-card h3 { margin: 0 0 4px; font-size: 18px; font-family: var(--serif); }
.mat-card .en { font-family: var(--mono); font-size: 11px; color: var(--ink-dim); letter-spacing: 0.04em; }
.mat-card p { margin: 10px 0 0; font-size: 14px; color: var(--ink-dim); }
.mat-card .example { font-size: 12.5px; color: var(--fog); border-left: 2px solid var(--line-strong); padding-left: 10px; margin-top: 12px; }

/* mechanism */
.mech-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(240px, 1fr)); gap: 16px; }
.mech-card { border: 1px solid var(--line-strong); border-radius: 12px; padding: 18px 20px; background: var(--bg-soft); }
.mech-card h3 { margin: 0 0 10px; font-size: 16px; color: var(--ember); font-family: var(--serif); }
.mech-card h3 small { color: var(--ink-dim); font-family: var(--mono); font-size: 11px; margin-left: 6px; }
.mech-row { display: flex; gap: 8px; font-size: 13px; margin: 6px 0; }
.mech-row b { flex: 0 0 auto; color: var(--cyan); font-family: var(--mono); font-size: 11px; font-weight: 500; padding-top: 2px; }
.mech-row span { color: var(--ink-dim); }
.mech-promise { margin-top: 10px; padding-top: 10px; border-top: 1px dashed var(--line-strong); font-size: 12.5px; color: var(--fog); }

/* species tabs */
.inv-tabs { display: flex; gap: 8px; flex-wrap: wrap; margin-bottom: 14px; }
.inv-tab {
  background: var(--bg-soft); border: 1px solid var(--line-strong); color: var(--ink-dim);
  border-radius: 999px; padding: 6px 16px; font-size: 13px; font-family: var(--mono); cursor: pointer;
}
.inv-tab.active { color: var(--ember); border-color: var(--ember); }

/* inventory */
.inv-status { font-size: 12px; color: var(--ink-dim); margin: 0 0 12px; }
.inv-status.live { color: var(--cyan); }
.inv-controls { display: flex; gap: 10px; flex-wrap: wrap; margin-bottom: 18px; }
.inv-search {
  flex: 1 1 240px; background: var(--bg-soft); border: 1px solid var(--line-strong); color: var(--ink);
  border-radius: 8px; padding: 9px 12px; font-size: 14px; font-family: var(--sans);
}
.inv-controls select { background: var(--bg-soft); border: 1px solid var(--line-strong); color: var(--ink); border-radius: 8px; padding: 9px 10px; font-size: 13px; }
.inv-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(320px, 1fr)); gap: 14px; }
.inv-card { border: 1px solid var(--line); border-radius: 10px; padding: 16px 18px; background: var(--bg-soft); display: flex; flex-direction: column; gap: 8px; }
.inv-card h4 { margin: 0; font-size: 15px; font-family: var(--serif); }
.inv-card .desc { margin: 0; font-size: 12.5px; color: var(--ink-dim); display: -webkit-box; -webkit-line-clamp: 3; -webkit-box-orient: vertical; overflow: hidden; }
.badges { display: flex; gap: 6px; flex-wrap: wrap; }
.badge { font-family: var(--mono); font-size: 10px; padding: 1px 8px; border-radius: 999px; border: 1px solid var(--line-strong); color: var(--ink-dim); }
.badge.official { color: var(--ember); border-color: var(--ember); }
.badge.facade { color: var(--cyan); border-color: var(--cyan); }
.inv-card .links { margin-top: auto; display: flex; gap: 14px; font-size: 11.5px; font-family: var(--mono); }

/* audience */
.aud-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(320px, 1fr)); gap: 16px; }
.aud-card { border: 1px solid var(--line-strong); border-radius: 12px; padding: 22px 24px; background: var(--bg-soft); }
.aud-card h3 { margin: 0 0 12px; font-family: var(--serif); font-size: 19px; }
.aud-card ul { margin: 0 0 16px; padding-left: 18px; color: var(--ink-dim); font-size: 14px; }
.aud-card li { margin: 7px 0; }
.cta { display: inline-block; border: 1px solid var(--cyan); border-radius: 8px; padding: 7px 14px; font-size: 13px; }

/* footer */
.footer { border-top: 1px solid var(--line); margin-top: 64px; }
.foot-grid { max-width: 1080px; margin: 0 auto; padding: 30px 20px 40px; }
.foot-brand { font-family: var(--serif); font-size: 15px; margin: 0 0 12px; }
.foot-links { display: flex; gap: 18px; flex-wrap: wrap; font-size: 12.5px; margin: 0 0 12px; }
.foot-links a { color: var(--ink-dim); }
.foot-corp { font-size: 11.5px; color: var(--ink-dim); margin: 0; }
.foot-corp a { color: var(--ink-dim); }

@media (max-width: 640px) {
  .hero { padding-top: 56px; }
  .topnav { margin-left: 0; }
}